Keep composer autocomplete visible after route hops (#1851)

* fix(app): keep composer autocomplete visible after route hops

Workspace callers now express only the target workspace. The navigation helper chooses whether to pop to a mounted host route or fall back, and active-workspace tracking ignores stale hidden route params while app-wide routes are foregrounded.

* test(app): address workspace navigation review

* fix(app): parse decoded legacy workspace routes

* fix(app): ignore decoded legacy tab routes

* test(app): use canonical offline workspace route

packages/app/src/utils/navigate-to-agent/resolve.test.ts

@@ -69,7 +69,6 @@ describe("resolveNavigateToAgent", () => {
         serverId: SERVER_ID,
         workspaceId: WORKSPACE_ID,
         target: { kind: "agent", agentId: AGENT_ID },
-        currentPathname: undefined,
         pin: true,
       },
     ]);
@@ -107,7 +106,6 @@ describe("resolveNavigateToAgent", () => {
         serverId: SERVER_ID,
         workspaceId: WORKSPACE_ID,
         target: { kind: "agent", agentId: AGENT_ID },
-        currentPathname: undefined,
         pin: undefined,
       },
     ]);